Answer:
=118.8 K= 154.2°C
Explanation:
COP_max of carnot heat pump= 
where T_H and T_C are temperatures of hot and cold reservoirs
Also COP=
in the question 
⇒
heat is added directly to be as efficient as via heat pump
and T_H= 24° C= 297 K
on calculating the above equation we get
=118.8 K
the outdoor temperature for efficient addition of heat to interior of home
=118.8 K= 154.2°C
A. iodine is located in period 5, group 17 and is classified
as a nonmetal
Group is the column, period is the raw.
Answer:
10 cm
Explanation:
Được
Tần số = 50 hertz
Khoảng cách đã đi = 25 m
Thời gian đi quãng đường 25 m = 5 giây
Tốc độ của sóng = 25/5 = 5 mét trên giây
Như chúng ta biết
Bước sóng = Vận tốc / tần số
Bước sóng = 5 mét trên giây / 50 trên giây
Bước sóng = 0,1 m = 10 cm
Answer: Option (c) is the correct answer.
Explanation:
Atomic number of hydrogen is 1 and one dot in its lewis structure displays only one electron. So, in order to complete its octet it needs one more electron.
Atomic number of carbon is 6 and its electronic distribution is 2, 4. Carbon needs 4 more electrons in order to complete its octet.
Atomic number of oxygen is 8 and its electronic distribution is 2, 6. In order to complete octet, oxygen needs 2 more electrons.
Atomic number of fluorine is 9 and its electronic distribution is 2, 7. In order to complete octet, fluorine needs 1 more electron.
Hence, we can conclude that out of the given options, lewis dot structure of oxygen atom needs 2 more electrons in its outermost shell.
